Accountant exploits movements for support (6)

I believe the answer is:

causes

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'movements for support' is the definition.
I can't tell whether this definition defines the answer.

'accountant exploits' is the wordplay.
'accountant' becomes 'ca' (abbreviation for chartered accountant).
'exploits' becomes 'uses' (use is a kind of exploit).
'ca'+'uses'='CAUSES'

Can you help me to learn more?

(Other definitions for causes that I've seen before include "They bring about effects" , "Brings" , "Factors" , "They give rise to effects" , "'Reasons, grounds (6)'" .)

I've seen this clue in the Sydney Morning Herald.

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